# How do you find the exact values of cos(5pi/12) using the half angle formula?

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By the double angle formula:

If

Note that

so

Therefore

Since

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Alan P.
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May 8, 2016

By the double angle formula:

If

Note that

so

Therefore

Since

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Write your answer here...

Start with a one sentence answer

Then teach the underlying concepts

Don't copy without citing sources

preview

?

Write a one sentence answer...

Explain in detail...

I want someone to double check my answer

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